The iPhone is growing iOS share across carriers AT&T and Verizon. This, according to reports, is happening at RIM’s (Research in Motion) loss. Both carriers saw a decline in Blackberry sales.

If Kantar Worldpanel Comtech’s research is accurate, Apple’s devices accounted for more than half of all smartphone sales in the US between mid-October and the end of November, reports website GigaOm.

According to the numbers, AT&T saw their biggest year-over-year growth in iOS device sales with the release of the iPhone 5. Verizon also saw huge sales for the iPhone and iOS devices accounted for 55 percent of their smartphone sales.

They also note that both carriers saw a decline in Blackberry sales. The smartphone has been on a decline ever since the rise of operating systems such as Apple’s iOS and Google’s Android. It’s still popular amongst Blackberry enthusiasts, but it seems to be hitting a low overall when it comes to the general consumer. It would be very hard for the platform to grow back into what it once was. Still, Nokia’s Symbian is sinking even further into irrelevance. Bummer, it’s an old favorite for many.